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I got some intel that someone ordered 0.2% crystal. Is this something which could help when working with thicker beams?

Smaller side on doping or length? My hope was to not going that tight on input or even do side pumping... Is it already lost? :-) For first tests my intention was to go with flat-flat. This way I can start with 99.5% dichroic mirrors I already have. Crystal AR coatings 0.5% for both...

Mine are 4mm long, 0.7%. What are the effects of the cut?

I currently have 2 Pr:YLF crystals at hand. Going to try them in the following months. We'll see if I can get any orange/red out of them :-) But their fluorescence is much weaker than I expected - I can see the Pr lines but that's about it, probably my pump laser had slightly wrong...